<?php
/* vim: set expandtab sw=4 ts=4 sts=4: */
/**
 *
 * @version $Id: get_foreign.lib.php 11335 2008-06-21 14:01:54Z lem9 $
 */
if (! defined('PHPMYADMIN')) {
	exit;
}

/**
 *
 */
require_once './libraries/Table.class.php';

/**
 * Gets foreign keys in preparation for a drop-down selector
 * Thanks to <markus@noga.de>
 */


// lem9: we always show the foreign field in the drop-down; if a display
// field is defined, we show it besides the foreign field
$foreign_link = false;
if ($foreigners && isset($foreigners[$field])) {
	$foreigner	   = $foreigners[$field];
	$foreign_db	  = $foreigner['foreign_db'];
	$foreign_table   = $foreigner['foreign_table'];
	$foreign_field   = $foreigner['foreign_field'];

	// Count number of rows in the foreign table. Currently we do
	// not use a drop-down if more than 200 rows in the foreign table,
	// for speed reasons and because we need a better interface for this.
	//
	// We could also do the SELECT anyway, with a LIMIT, and ensure that
	// the current value of the field is one of the choices.

	$the_total   = PMA_Table::countRecords($foreign_db, $foreign_table, TRUE);

	if ((isset($override_total) && $override_total == true) || $the_total < $cfg['ForeignKeyMaxLimit']) {
		// foreign_display can be FALSE if no display field defined:
		$foreign_display = PMA_getDisplayField($foreign_db, $foreign_table);

		$f_query_main = 'SELECT ' . PMA_backquote($foreign_field)
						. (($foreign_display == FALSE) ? '' : ', ' . PMA_backquote($foreign_display));
		$f_query_from = ' FROM ' . PMA_backquote($foreign_db) . '.' . PMA_backquote($foreign_table);
		$f_query_filter = empty($foreign_filter) ? '' : ' WHERE ' . PMA_backquote($foreign_field)
							. ' LIKE "%' . PMA_sqlAddslashes($foreign_filter, TRUE) . '%"'
							. (($foreign_display == FALSE) ? '' : ' OR ' . PMA_backquote($foreign_display)
								. ' LIKE "%' . PMA_sqlAddslashes($foreign_filter, TRUE) . '%"'
								);
		$f_query_order = ($foreign_display == FALSE) ? '' :' ORDER BY ' . PMA_backquote($foreign_table) . '.' . PMA_backquote($foreign_display);
		$f_query_limit = isset($foreign_limit) ? $foreign_limit : '';

		if (!empty($foreign_filter)) {
			$res = PMA_DBI_query('SELECT COUNT(*)' . $f_query_from . $f_query_filter);
			if ($res) {
				$the_total = PMA_DBI_fetch_value($res);
				@PMA_DBI_free_result($res);
			} else {
				$the_total = 0;
			}
		}

		$disp			= PMA_DBI_query($f_query_main . $f_query_from . $f_query_filter . $f_query_order . $f_query_limit);
		if ($disp && PMA_DBI_num_rows($disp) > 0) {
			// garvin: If a resultset has been created, pre-cache it in the $disp_row array
			// This helps us from not needing to use mysql_data_seek by accessing a pre-cached
			// PHP array. Usually those resultsets are not that big, so a performance hit should
			// not be expected.
			$disp_row = array();
			while ($single_disp_row = @PMA_DBI_fetch_assoc($disp)) {
				$disp_row[] = $single_disp_row;
			}
			@PMA_DBI_free_result($disp);
		}
	} else {
		unset($disp_row);
		$foreign_link = true;
	}
}  // end if $foreigners

?>
